6x+1/2a -x-2/2a

To simplify the expression 6x + (1/2)a - x - (2/2)a, we need to combine like terms.

First, let's simplify the coefficients of x. The expression contains 6x and -x, which means we have a total of 6x - 1x. Combining these terms gives us 5x.

Next, let's simplify the coefficients of a. The expression contains (1/2)a and (-2/2)a, which means we have a total of (1/2)a - (2/2)a. In this case, we need to find a common denominator for the fractions. The common denominator is 2. Therefore, (1/2)a - (2/2)a becomes (1/2)a - (4/4)a. Now, subtract the numerators and keep the common denominator, giving us (-3/4)a.

Now we can rewrite the simplified expression as 5x - (3/4)a.